#include<bits/stdc++.h>
#define ONLINE_JUDGE
#define ll long long
#define ull unsigned long long
using namespace std;

const int N = 110, INF = 0x3f3f3f3f;

int n, m;
int a[N];

void solve()
{
    cin >> n >> m;
    a[0] = INF;
    for (int i = 1;i <= m;i++) {
        int x;cin >> x;
        if (x != 0) { a[x]++;cout << x << ' '; } else {
            int mi = 0;
            for (int j = 1;j <= n;j++)
                if (a[j] < a[mi]) mi = j;
            a[mi]++;
            cout << mi << ' ';
        }
    }
}

signed main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);cout.tie(0);
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    int T = 1;
    //cin>>T;
    for (int i = 1;i <= T;i++) {
        solve();
    }
}